About method LoadTemplate()

TBS manual

Syntax: $TBS->LoadTemplate(string File{, string HtmlCharSet})

Adding the file at the end of the current template:
You can use the keyword '+' instead of the the charset to have the file added to the end of the current template. Charset parameter stay the same as for the first template.
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I don't understand keyword '+' of method of using

can you give me a example

$TBS->LoadTemplate('header.html');
$TBS->LoadTemplate('body.html', '+'); // Add body after header
$TBS->LoadTemplate('footer.html', '+'); // Add footer after header + body

// Happy merging!

Thank you!